Amidoheteroaryl aroyl hydrazide ethynes

ABSTRACT

The present invention relates to novel amidoheteroaryl aroyl hydrazide ethynes as tyrosine kinase inhibitors, process of preparation thereof, and use of the compounds for preparation of pharmaceutical compositions in the therapeutic treatment of disorders related to tyrosine kinases in humans.

RELATED APPLICATIONS

This application claims the benefit of Indian Patent Application no.1953/MUM/2015 filed on May 18, 2015 which is hereby incorporated byreference.

FIELD OF INVENTION

The present invention relates to novel amidoheteroaryl aroyl hydrazideethynes as tyrosine kinase inhibitors, process of preparation thereof,and use of the compounds for preparation of pharmaceutical compositionsin the therapeutic treatment of disorders related to tyrosine kinases inhumans.

BACKGROUND OF THE INVENTION

Protein tyrosine kinases are currently recognized as important moleculartargets for drug development in the treatment of several disorders,particularly in the treatment of proliferative disorders. Dysregulationof tyrosine kinase activity has emerged as a major mechanism by whichcancer cells evade normal physiological constraints on growth,proliferation and survival. One of the key focus areas in anti-TK drugdiscovery is the design and development of small molecules that candirectly inhibit catalytic activity of the kinase by interfering withthe binding of ATP or substrates. An important advantage of TK-directedtherapy is the possibility to perform pharmacodynamic studies thatcorrelate inhibition of the targeted TK in cancer cells with clinicalresponses to the drug.

Classical tyrosine kinase inhibitors, which are predominantly theBcr-Abl kinase inhibitors that are currently in clinical use, aredescribed in the following patent literature:

-   -   U.S. Pat. No. 5,521,184 (the '184 patent): Exemplifies        4-[(Methyl-1-piperazinyl)methyl]-N-[4-methyl-3-[[4-(3-pyridinyl)-2-pyrimidinyl]amino]-phenyl]benzamide        methanesulfonate (Imatinib mesylate, Gleevec®)    -   U.S. Pat. No. 7,169,791 (the '791 patent): Exemplifies        4-Methyl-N-[3-(4-methyl-imidazol-1-yl)-5-trifluoromethyl-phenyl]-3-(4-pyridin-3-yl-pyrimidin-2-ylamino)-benzamide        (Nilotinib, Tasigna®)    -   U.S. Pat. No. 6,596,746 (the '746 patent): Exemplifies        N-(2-chloro-6-methylphenyl)-2-(6-(4-(2-hydroxyethyl)piperazin-1-yl)-2-methylpyrimidin-4-ylamino)thiazole-5-carboxamide        (Dasatinib, Sprycel®)

While the second generation TK inhibitors in clinic viz. nilotinib anddasatinib have provided additional treatment option to patients who havedeveloped resistance to imatinib, there are certain shortcomings withregard to their side effects. Particularly in the case of dasatinib, theincreased potency may be associated with untoward off-target toxicities,which probably relate to their inhibitory activity against a broaderrange of protein kinases such as Kit, PDGFR and ephrin receptor (EphA2)tyrosine kinases which are directly implicated in haematopoiesis,control of tissue interstitial-fluid pressure and angiogenesis. Theseeffects may provide the physiological explanation for some of thetoxicities associated with dasatinib therapy such as myelosuppressionand pleural effusion. Besides, treatment with highly potent Abl kinaseinhibition has potential for the development of cardiotoxicity inpatients with CML.

Studies have shown that patients taking imatinib develop resistance tothe drug during the course of therapy. Recent research has provided abetter understanding of the mechanism of resistance which led to thedevelopment of second generation TK inhibitors. Although the secondgeneration TK inhibitors in clinic provide treatment alternatives forpatients who develop resistance to imatinib therapy, the prognosis forthe patients having T315I mutation is not good since none of thesecurrently marketed therapies are effective. There is thus an unmetmedical need with regard to treatment of patients having the T315Imutation. Omacetaxine (homoharringtonine) is approved by the FDA for CMLpatients with T315I. However, it is an intravenous drug with anon-specific mechanism of action. Ariad Compound Ponatinib (AP24534,U.S. Pat. No. 8,114,874) is also approved by US FDA but has a boxedwarning for risk-threatening blood clots and severe narrowing of bloodvessels. Other drug candidates in clinical phase include the Decipheracompound DCC-2036 (PCT Publication No. WO 2008/046003). The presentapplicant previously reported novel diarylacetylene hydrazides astyrosine kinase inhibitors published as WO 2012/098416 A1.

The current invention describes novel amidoheteroaryl aroyl hydrazideethynes containing compounds which are not only potent inhibitors of Abltyrosine kinase but also on its mutant versions.

SUMMARY

The present invention provides compounds of Formula I

and pharmaceutically acceptable salts thereof wherein,

R₁ is selected from —C₃₋₆ cycloalkyl, —C₁₋₆ alkyl-NH₂, —C₁₋₆alkyl-NH(C₁₋₆ alkyl), —C₁₋₆ alkyl-N(C₁₋₆ alkyl)₂, —C₃₋₆ alkenyl, —C₃₋₆alkynyl, —C₁₋₆ alkyl, —C(O) heterocyclyl, heterocyclyl-C₁₋₆ alkyl, —C₁₋₆haloalkyl, —NH(C₃₋₆ cycloalkyl) and heterocyclyl wherein heterocyclyl is5-6 membered non-aromatic ring containing 1 to 2 heteroatom individuallyselected from N, O or S;

R₁ is optionally substituted with one or more group independentlyselected from —C₁₋₄ alkyl, halogen, CN, NH(C₁₋₆ alkyl), N(C₁₋₆ alkyl)₂,NH₂ and hydroxy;

R₂ and R₃ are individually selected from a group of hydrogen, halogen,—C₁₋₄ alkyl, —C₁₋₄ haloalkyl, heterocyclyl-C₁₋₄ alkyl and heteroarylwherein, heterocyclyl is 5-6 membered non-aromatic ring containing 1 to2 heteroatom independently selected from N, O or S and is unsubstitutedor substituted with —C₁₋₄ alkyl and heteroaryl is 5-6 membered aromaticring containing 1 to 2 heteroatom independently selected from N, O or Sand is unsubstituted or substituted with —C₁₋₄ alkyl.

The compounds of the present invention are potent inhibitors of Abltyrosine kinase including its mutants, and can be used for treating thedisease which responds to an inhibition of a tyrosine kinase, especiallya neoplastic disease.

Definition

The following are definitions of the terms used in this specification.The initial definition provided for a group or term herein applies tothat group or term throughout the present specification, individually oras part of another group, unless otherwise indicated. The term“cycloalkyl” denotes a non-aromatic mono-, or multicyclic ring system of3 to about 13 carbon atoms. Monocyclic rings include, but are notlimited to cylcopropyl, cyclobutyl, cyclopentyl and cyclohexyl. Examplesof simple multicyclic cycloalkyl groups include perhydronapththyl,perhydroindenyl etc; bridged multicyclic groups include adamantyl andnorbornyl etc, and spriromulticyclic groups for e.g.,spiro(4,4)non-2-yl. Unless set forth or recited to the contrary, allcycloalkyl groups described or claimed herein may be substituted orunsubstituted.

The term “alkyl” refers to a hydrocarbon chain radical that includessolely carbon and hydrogen atoms in the backbone, either linear orbranched, having from one to eight carbon atoms, both inclusive, andwhich is attached to the rest of the molecule by a single bond, e.g.,methyl, ethyl, n-propyl, 1-methylethyl (isopropyl), n-butyl, n-pentyl,and 1,1-dimethylethyl (t-butyl). The term “C₁₋₆ alkyl” refers to analkyl chain, linear or branched having 1 to 6 carbon atoms, bothinclusive. Unless set forth or recited to the contrary, all alkyl groupsdescribed or claimed herein may be, substituted or unsubstituted.

The term “alkenyl” refers to a hydrocarbon chain containing from 3 to 6carbon atoms, both inclusive and including at least one carbon-carbondouble bond which is not in the 1 position, and may have (E) or (Z)configuration. Non-limiting examples of alkenyl groups include2-propenyl (allyl), 2-methyl-2-propenyl, and (Z)-2-butenyl. Unless setforth or recited to the contrary, all alkenyl groups described orclaimed herein may be straight chain or branched, substituted orunsubstituted.

The term “alkynyl” refers to a hydrocarbyl radical having at least onecarbon-carbon triple bond which is not in the 1 position, and having 3to about 8 carbon atoms, both inclusive (with radicals having 3 to about6 carbon atoms being preferred). Non-limiting examples of alkynyl groupsinclude 2-propynyl and 3-butynyl. Unless set forth or recited to thecontrary, all alkynyl groups described or claimed herein may be straightchain or branched, substituted or unsubstituted.

The term “heterocyclic ring” or “heterocyclyl” unless otherwisespecified refers to substituted or unsubstituted non-aromatic 5 to 10membered ring, preferably 5-6 membered ring, which consists of carbonatoms and from one to five heteroatoms selected from nitrogen, oxygenand sulfur. The heterocyclic ring radical may be a mono-, bi- ortricyclic ring system, which may include fused, bridged or spiro ringsystems, and the nitrogen, phosphorus, carbon, oxygen or sulfur atoms inthe heterocyclic ring radical may be optionally oxidized to variousoxidation states. In addition, the nitrogen atom may be optionallyquarternized; also, unless otherwise constrained by the definition theheterocyclic ring or heterocyclyl may optionally contain one or moreolefinic bond(s). Examples of such heterocyclic ring radicals include,but are not limited to azepinyl, azetidinyl, benzodioxolyl,benzodioxanyl, chromanyl, dioxolanyl, dioxaphospholanyl, isoxazolidinyl,morpholinyl, oxazolinyl, oxazolidinyl, oxadiazolyl, 2-oxopiperazinyl,2-oxopiperidinyl, 2-oxopyrrolidinyl, 2-oxoazepinyl, octahydroindolyl,octahydroisoindolyl, perhydroazepinyl, piperazinyl, 4-piperidonyl,pyrrolidinyl, piperidinyl, phenothiazinyl, phenoxazinyl, quinuclidinyl,tetrahydroisquinolyl, tetrahydrofuryl, tetrahydropyranyl, thiazolinyl,thiazolidinyl, thiamorpholinyl, thiamorpholinyl sulfoxide andthiamorpholinyl sulfone. The heterocyclic ring radical may be attachedto the main structure at any heteroatom or carbon atom that results inthe creation of a stable structure. Unless set forth or recited to thecontrary, all heterocyclyl groups described or claimed herein may besubstituted or unsubstituted.

The terms “halogen” or “halo” means fluorine, chlorine, bromine oriodine. Similarly, “haloalkyl” or “haloalkoxy” refers to an alkyl oralkoxy group substituted with one or more halogen atoms.

The term “heteroaryl” unless otherwise specified refers to substitutedor unsubstituted 5 to 14 membered aromatic heterocyclic ring radicalswith one or more heteroatom(s) independently selected from N, O or S.The heteroaryl may be a mono-, bi- or tricyclic ring system. Theheteroaryl ring radical may be attached to the main structure at anyheteroatom or carbon atom that results in the creation of a stablestructure. Examples of such heteroaryl ring radicals include, but arenot limited to oxazolyl, isoxazolyl, imidazolyl, furyl, indolyl,isoindolyl, pyrrolyl, triazolyl, triazinyl, tetrazoyl, thienyl,thiazolyl, isothiazolyl, pyridyl, pyrimidinyl, pyrazinyl, pyridazinyl,benzofuranyl, benzothiazolyl, benzoxazolyl, benzimidazolyl,benzothienyl, benzopyranyl, carbazolyl, quinolinyl, isoquinolinyl,quinazolinyl, cinnolinyl, naphthyridinyl, pteridinyl, purinyl,quinoxalinyl, quinolinyl, isoquinolinyl, thiadiazolyl, indolizinyl,acridinyl, phenazinyl, imidazo[1,2-a]pyridyl, imidazo[1,2-a]pyridine andphthalazinyl. Unless set forth or recited to the contrary, allheteroaryl groups described or claimed herein may be substituted orunsubstituted.

Salts of compounds of Formula I are the physiologically acceptablesalts. Physiologically acceptable salts are particularly suitable formedical applications, due to their greater solubility in water comparedwith the starting or base compounds. Suitable physiologically acceptableacid addition salts of the compounds of the invention may be salts ofinorganic acids such as hydrochloric acid, hydrobromic acid, phosphoricacid, and the like or of organic acids such as, for example, aceticacid, benzenesulfonic acid, methanesulfonic acid, benzoic acid, citricacid, glycolic acid, lactic acid, fumaric acid, succinic acid, adipicacid, pimelic acid, suberic acid, azelaic acid, malic acid, tartarticacid, amino acids, such as glutamic acid or aspartic acid,butanedisulfonic acid and the like.

DETAILED DESCRIPTION OF THE INVENTION

In one aspect the present invention provides a compound of Formula I

and pharmaceutically acceptable salts thereof wherein,

R₁ is selected from —C₃₋₆ cycloalkyl, —C₁₋₆ alkyl-NH₂, —C₁₋₆alkyl-NH(C₁₋₆ alkyl), —C₁₋₆ alkyl-N(C₁₋₆ alkyl)₂, —C₃₋₆ alkenyl, —C₁₋₆alkyl, —C₃₋₆ alkynyl, —C(O) heterocyclyl, heterocyclyl-C₁₋₆ alkyl, —C₁₋₆haloalkyl, —NH(C₃₋₆ cycloalkyl) and heterocyclyl wherein heterocyclyl is5-6 membered non-aromatic ring containing 1 to 2 heteroatom individuallyselected from N, O or S;

R₁ is optionally substituted with one or more group independentlyselected from —C₁₋₄ alkyl, halogen, CN, NH(C₁₋₆ alkyl), N(C₁₋₆ alkyl)₂,NH₂ and hydroxy;

R₂ and R₃ are individually selected from a group of hydrogen, halogen,—C₁₋₄ alkyl, —C₁₋₄ haloalkyl, heterocyclyl-C₁₋₄ alkyl and heteroarylwherein, heterocyclyl is 5-6 membered non-aromatic ring containing 1 to2 heteroatom independently selected from N, O or S and is unsubstitutedor substituted with —C₁₋₄ alkyl and heteroaryl is 5-6 membered aromaticring containing 1 to 2 heteroatom independently selected from N, O or Sand is unsubstituted or substituted with —C₁₋₄ alkyl.

In one embodiment, R₁ is —C₃₋₆ cycloalkyl.

In one embodiment, the compound of Formula I is selected from a groupcomprising:

-   Cyclopropanecarboxylic acid    (5-{5-[N′-(2-chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)amide;-   N-(5-{5-[N′-(2-chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-2-dimethylaminoacetamide;-   N-(5-{5-[N′-(2-Chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-3-(4-methyl-piperazin-1-yl)propionamide;-   N-(5-{5-[N′-(2-Chloro-6-methyl-benzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-2-(4-dimethylaminopiperidin-1-yl)acetamide;-   N-(5-{5-[N′-(2-Chloro-6-methyl-benzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-2-(3-dimethylaminopyrrolidin-1-yl)acetamide;-   N-(5-{5-[N′-(2-Chloro-6-methyl-benzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)acetamide;-   Cyclopropanecarboxylic acid    [5-(2-methyl-5-{N′-[4-(4-methylpiperazin-1-ylmethyl)benzoyl]-hydrazinocarbonyl}phenylethynyl)pyridin-2-yl]amide;-   Cyclopropanecarboxylic acid    [5-(2-methyl-5-{N′-[3-(4-methylimidazol-1-yl)-5-trifluoromethylbenzoyl]-hydrazinocarbonyl}phenylethynyl)pyridin-2-yl]amide;-   1-(5-{5-[N′-(2-Chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methylphenylethynyl}-pyridin-2-yl)-3-cyclopropylurea;-   N-(5-{5-[N′-(2-(Chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methylphenylethynyl}-pyridin-2-yl)-2,2,2-trifluoroacetamide;-   Cyclopropanecarboxylic acid    [5-(2-methyl-5-{N′-[4-(4-methylpiperazin-1-yl-methyl)-3-trifluoromethylbenzoyl]-hydrazinocarbonyl}phenylethynyl)pyridin-2-yl]amide;-   N-(5-{5-[N′-(2-(Chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methylphenylethynyl}-pyridin-2-yl)butyramide;

In a preferred embodiment, the compound of Formula I is selected from agroup comprising:

-   Cyclopropanecarboxylic acid    (5-{5-[N′-(2-chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)amide;-   Cyclopropanecarboxylic acid    [5-(2-methyl-5-{N′-[4-(4-methylpiperazin-1-ylmethyl)benzoyl]-hydrazinocarbonyl}phenylethynyl)pyridin-2-yl]amide;-   Cyclopropanecarboxylic acid    [5-(2-methyl-5-{N′-[3-(4-methylimidazol-1-yl)-5-trifluoromethylbenzoyl]-hydrazinocarbonyl}phenylethynyl)pyridin-2-yl]amide;-   Cyclopropanecarboxylic acid    [5-(2-methyl-5-[N′-[4-(4-methylpiperazin-1-yl-methyl)-3-trifluoromethylbenzoyl]-hydrazinocarbonyl]phenylethynyl)pyridin-2-yl]amide;

In one embodiment of the process for preparing compounds of the presentinvention, the compounds of Formula I can be prepared as per followinggeneral scheme 1

The process involves condensation of the hydrazide of Formula III withthe diarylacetylenic compound of Formula II, wherein R₁, R₂ & R₃ are aspreviously defined for compound of Formula I, and L is a leaving group.Preferably the condensation reaction is carried out in the presence ofan inert base and/or a suitable catalyst in an inert solvent.

The compound of the Formula II in activated form (i.e. —C(O)-L) isespecially an acid halide, an ester an anhydride or a cyclic imide.

The esters of Formula II can be selected from, for example vinyl estersobtainable, for example, by transesterification of a corresponding esterwith vinyl acetate, carbamoylvinyl esters or by treatment with a C₂₋₅alkoxyacetylene. Other active esters are of the amidino type, such asN,N′-disubstituted amidino esters (obtainable, for example, by treatmentof the corresponding acid with a suitable N,N′-disubstitutedcarbodiimide, for example, N,N′-dicyclohexylcarbodiimide), orN,N′-disubstituted amidino esters (obtainable, for example, treatment ofthe corresponding acid with N,N-disubstituted cyanamide), suitable arylesters, especially phenyl esters suitably substituted byelectron-attracting substituents (obtainable, for example, by treatmentof the corresponding acid with a suitably substituted phenol, forexample, 4-nitrophenol, 2,4,5-trichlorophenol, or2,3,4,5,6-pentachloro-phenol in the presence of a condensation agent,such as N,N′-dicyclohexylcarbodiimide). Other suitable active estersinclude cyanomethyl esters (obtainable, for example, by treatment of thecorresponding acid with chloroacetonitrile in the presence of a base),thio esters, especially unsubstituted or substituted, for examplenitro-substituted, phenylthio esters (obtainable, for example, bytreatment of the corresponding acid with unsubstituted or substituted,for example nitro-substituted, thiophenols, inter alia by the anhydrideor carbodiimide method), amino or amido esters (obtainable, for example,by treatment of the corresponding acid with an N-hydroxyamino orN-hydroxyamido compound, for example, N-hydroxysuccinimide,N-hydroxypiperidine, N-hydroxyphthalimide or 1-hydroxybenzotriazole, forexample by the anhydride or carbodiimide method).

The anhydrides of the compound of Formula II may be formed with carbonicacid semiderivatives, such as corresponding esters, for example carbonicacid alkyl semiesters (obtainable, for example, by treatment of thecorresponding acid with haloformic, such as chloroformic, acid); alkylesters or with a 1-alkoxycarbonyl-2-alkoxy-1,2-dihydroquinoline, forexample 1-alkoxycarbonyl-2-ethoxy-1,2-dihydroquinoline; anhydrides withdihalogenated, especially dichlorinated phosphoric acid (obtainable, forexample, by treatment of the corresponding acid with phosphorusoxychloride), or anhydrides with organic acids, such as mixed anhydrideswith organic carboxylic acids (obtainable, for example, by treatment ofthe corresponding acid with an unsubstituted or substituted acyl halide,for example, pivaloyl chloride or trifluoroacetyl chloride). Anhydridesmay also be with organic sulfonic acids (obtainable, for example, bytreatment of a salt, such as an alkali metal salt, of the correspondingacid, with a suitable organic sulfonic acid halide, such as alkane- oraryl-, for example methane- or p-toluenesulfonyl chloride), or withorganic phosphonic acids (obtainable, for example, by treatment of thecorresponding acid with a suitable organic phosphonic anhydride orphosphonic cyanide).

Suitable cyclic amides are especially amides with five-membereddiazacycles of aromatic character, such as with imidazoles (obtainable,for example, by treatment of the corresponding acid withN,N′-carbonyldiimidazole; imidazolide method), or pyrazoles, for example3,5-dimethylpyrazole.

Formula II in activated form is preferably generated in situ from thecorresponding acid (i.e. when L=OH). For example, N,N′-disubstitutedamidino esters can be formed in situ by reacting a mixture of the acidof Formula II (i.e. when L=OH) and the compound of Formula III in thepresence of a suitable condensating agent for exampleN,N′-dicyclohexylcarbodiimide. Reactive mixed anhydrides of the acid mayalso be generated with an organic phosphonic acid in situ by reactionwith propylphosphonic anhydride or diethylcyanophosphonate in thepresence of suitable base for e.g. triethylamine or4-(N,N-dimethylamino)pyridine. The reaction may be carried out in amanner known per se, the reaction conditions being dependent especiallyon how the acid group of Formula II has been activated, usually in thepresence of a suitable solvent or diluent or of a mixture thereof and,if necessary, in the presence of a condensation agent. Customarycondensation agents are, for example, carbodiimides such asN,N′-diethyl-, N,N′-diisopropyl, N,N′-dicyclohexyl- orN-ethyl-N′-(3-diethylaminopropyl)-carbodiimide; suitable carbonylcompounds, for example carbonyldiimidazole, or 1,2-oxazolium compounds,for example 2-ethyl-5-phenyl-1,2-oxazolium 3′-sulfonate and2-tert-butyl-5-methyl-isoxazolium perchlorate, or a suitable acylaminocompound, for example, 2-ethoxy-1-ethoxycarbonyl-1,2-dihydroquinoline.The bases normally used for aiding the condensation are either inorganicbases such as sodium or potassium carbonate, or organic bases, such aspyridine, triethyamine, N,N-diisopropylethylamine or4-(dimethylamino)pyridine.

Alternatively, the preparation of compounds of Formula I in the presentinvention can be performed by reacting compounds of Formula IV with thecompounds of Formula V, Scheme 2, using similar condensation methods asdescribed above (for Scheme 1); wherein R₁, R₂, R₃ and L are aspreviously defined.

Compounds of Formula IV can be prepared from compounds of Formula II andhydrazine of Formula Ma, Scheme 3, utilizing the coupling procedures asdescribed for Scheme 1, vide supra.

In a similar manner the compounds of Formula III can be prepared by thereaction of compounds of hydrazine hydrate and Formula V, Scheme 4.

The compounds of Formula II can be prepared by methods known in theliterature. Suitable approaches for the preparation of the compounds forFormula II are provided in Scheme 5.

As illustrated in Scheme 5, the ethynyl moiety of pyridine of FormulaVIII is coupled with phenyl ring of Formula IX, or the ethynyl moiety ofphenyl ring of Formula VII is coupled with pyridine ring of Formula VI;wherein ‘W’ represents a leaving group like OTf, Cl, Br or I, preferablyBr or I; L represent OH or O-alkyl. The coupling reaction can beperformed using well known prior art methods, such as metal catalyzedcoupling reactions, for example a palladium catalyzed Sonogashiracoupling reaction (refer Malleron, J-L., Fiaud, J-C., Legros, J-Y.Handbook of Palladium Catalyzed Organic Reactions, San Diego: AcademicPress, 1997). Alternatively, the compound of Formula II is prepared fromthe vicinal dihalo compound of Formula IIa (where Z represents halo) bytandem dehydrohalogenations.

A strategy similar to the above can be utilized for the synthesis ofcompounds of Formula I as shown in Scheme 6, i.e. coupling the ethynylmoiety of pyridine ring of Formula VIII to the phenyl ring in FormulaXI, or the ethynyl moiety of phenyl ring of Formula X to the pyridinering in Formula VI; wherein W, R₁, R₂ and R₃ are as previously defined.

The compounds of Formula X & Formula XI can be conveniently prepared byacylation of the hydrazide of Formula III with compounds of Formula VII& Formula IX, respectively, as shown in Scheme 7; wherein L, W, X, R₁,R₂ and R₃ are as previously defined.

The compounds of Formula I can also be prepared by acylation of theamine of Formula XII as shown in Scheme 8.

Where the above starting compounds VI, VII, VIII and IX containfunctional groups that may interfere with the coupling reaction, areprotected using suitable protecting groups that can be convenientlyremoved later.

Characterization data for some of the representative compounds ofFormula I are provided in the Table-1.

TABLE 1 Compd ID IUPAC Name ¹H NMR (δ ppm) in DMSO-d₆ as solvent I.1cyclopropanecarboxylic acid (5- 0.89 (m, 4H), 1.13-1.16 (t, 1H, J = 7.0Hz), 2.52 (s, 3H), 2.60 (s, {5-[N′-(2-chloro-6- 3H), 7.31-7.35 (m, 1H),7.38-7.43 (m, 2H), 7.53 (d, 1H, J = 8.0methylbenzoyl)hydrazinocarbonyl]- Hz), 7.92-7.95 (m, 1H), 8.02-8.05 (m,1H), 8.18-8.22 (m, 2H), 2-methyl-phenylethynyl}- 8.62 (m, 1H), 10.52 (s,1H), 10.71 (s, 1H), 11.12 (s, 1H). pyridin-2-yl)amide I.2N-(5-{5-[N′-(2-chloro-6-methyl- 2.42 (s, 3H), 2.69 (s, 3H), 2.93 (s,6H), 4.28 (br, 2H), 7.33 (m, benzoyl)hydrazinocarbonyl]-2- 1H),7.40-7.43 (m, 2H), 7.56 (d, 1H, J = 8.1 Hz), 7.60-7.68 (m,methyl-phenylethynyl}-pyridin-2- 1H), 7.95 (m, 1H), 8.14-8.18 (m, 3H),8.69 (m, 1H), 9.99 (br, yl)-2-dimethylaminoacetamide 1H), 10.53 (s, 1H),10.72 (s, 1H), 11.46(s, 1H). I.3 N-(5-{5-[N′-(2-Chloro-6- 2.52 (s, 3H),2.60 (s, 3H), 2.88 (s, 3H), 3.07 (m, 2H), 3.70-3.73methylbenzoyl)hydrazinocarbonyl]- (m, 8H), 7.31-7.34 (m, 1H), 7.39-7.44(m, 2H), 7.56 (d, 1H, J = 2-methyl-phenylethynyl}- 8.1 Hz), 7.95 (d, 1H,J = 8.1 Hz), 8.09 (d, 1H, J = 8.0 Hz), 8.18- pyridin-2-yl)-3-(4-methyl-8.21 (m, 2H), 8.64 (s, 1H), 10.53 (s, 1H), 10.72 (s, 1H), 11.09 (s,piperazin-1-yl)propionamide 1H), 11.80 (m, 2H). I.4N-(5-{5-[N′-(2-Chloro-6-methyl- 1.70-1.73 (m, 2H), 2.00 (m, 2H),2.27-2.33 (m, 2H), 2.52 (s, 3H), benzoyl)hydrazinocarbonyl]-2- 2.60 (s,3H), 2.66 (br, 5H), 2.91-2.97 (m, 3H), 3.03-3.06 (m, 3H),methyl-phenylethynyl}-pyridin-2- 7.32-7.33 (m, 1H), 7.38-7.39 (m, 2H),7.55 (d, 1H, J = 8.0 Hz), yl)-2-(4-dimethylamino piperidin- 7.94 (d, 1H,J = 8.0 Hz), 8.08-8.11 (m, 1H), 8.19 (s, 1H), 8.23(d, 1-yl)acetamide 1H,J = 8.6 Hz), 8.63 (m, 1H), 10.26 (s, 1H), 10.53 (s, 1H), 10.72(s, 1H).I.5 N-(5-{5-N′-(2-Chloro-6-methyl- 2.55 (s, 3H), 2.61 (s, 3H), 2.72-2.86(m, 6H), 2.93-3.00 (m, 2H), benzoyl)hydrazine carbonyl]-2- 4.10 (br,2H), 4.43 (br, 2H), 7.32-7.38 (m, 1H), 7.40-7.43 (m, methyl-phenylethynyl}-pyridin-2- 2H), 7.56 (d, 1H, J = 8.0 Hz), 7.94-7.97 (m, 1H),8.14-8.19 (m, yl)-2-(3-dimethylaminopyrrolidin- 3H), 8.69 (s, 1H), 10.54(s, 1H), 1072 (s, 1H), 11.45(s, 1H). 1-yl)acetamide I.6N-(5-{5-[N′-(2-Chloro-6-methyl- 2.18 (s, 3H), 2.52 (s, 3H), 2.60 (s,3H), 7.33 (m, 1H), 7.40-7.41 benzoyl)hydrazinocarbonyl]-2- (m, 2H), 7.55(d, 1H, J = 8.1 Hz), 7.93-7.95 (m, 1H), 8.03-8.06methyl-phenylethynyl}-pyridin-2- (m, 1H), 8.18-8.23 (m, 2H), 8.61 (m,1H), 10.53 (s, 1H), 10.72 yl)acetamide (s, 1H), 10.82 (s, 1H). I.7Cyclopropanecarboxylic acid [5- 0.88-0.90 (m, 4H), 1.36 (m, 1H), 2.03(m, 1H), 2.41 (br, 6H), (2-methyl-5-{N′-[4-(4-methyl- 2.69-2.72 (m, 3H),2.92-2.97 (m, 3H), 3.61 (br, 3H), 7.50-7.55piperazin-1-ylmethyl)benzoyl]- (m, 3H), 7.87-7.92 (m, 3H), 8.00-8.02 (m,1H), 8.09 (s, 1H), hydrazinocarbonyl}phenyl- 8.16 (d, 1H, J = 8.6 Hz),8.58(s, 1H), 10.70 (br, 2H), 11.15 (s, ethynyl)pyridin-2-yl]amide 1H).I.8 Cyclopropanecarboxylic acid [5- 0.73-0.74 (m, 4H), 1.92 (m, 1H),2.08 (s, 3H), 2.45 (s, 3H), 7.41 (2-methyl-5-{N′-[3-(4-methyl- (d, 1H, J= 8.0 Hz), 7.62 (br, 1H), 7.77 (d, 1H, J = 7.8 Hz), 7.87-imidazol-1-yl)-5-trifluoromethyl- 7.89 (m, 1H), 7.99 (s, 1H), 8.05 (m,2H), 8.19 (s, 1H), 8.31(s, benzoyl]-hydrazinocarbonyl}phenyl- 2H), 8.46(s, 1H), 10.66 (s, 1H), 10.80 (s, 1H), 10.96 (s, 1H).ethynyl)pyridin-2-yl]amide I.9 1-(5-{5-[N′-(2-Chloro-6- 0.51-0.72 (m,4H), 2.38 (s, 3H), 2.55 (s, 3H), 3.51 (m, 1H), 7.33-methylbenzoyl)hydrazinocarbonyl]- 7.39 (m, 3H), 7.55-7.64 (m, 2H), 7.93(m, 3H), 8.15(s, 1H), 8.48 2-methylphenylethynyl}- (s, 1H), 9.40 (s,1H), 10.52 (s, 1H), 10.70 (s, 1H). pyridin-2-yl)-3-cyclopropylurea I.10N-(5-{5-[N′-(2-(Chloro-6-methyl- 2.52 (s, 3H), 2.62 (s, 3H), 7.33 (m,1H), 7.40-7.41 (m, 2H), 7.57 benzoyl)hydrazinocarbonyl]-2- (d, 1H, J =9.2 Hz), 7.96 (d, 1H, J = 8.0 Hz), 8.12 (d, 1H, J = 8.6methylphenylethynyl}-pyridin-2- Hz), 8.19 (s, 1H), 8.21 (s, 1H), 8.76(s, 1H), 10.53 (s, 1H), 10.72 yl)-2,2,2-trifluoroacetamide (s, 1H),12.34 (s, 1H). I.11 Cyclopropanecarboxylic acid [5- 0.89-0.90 (m, 4H),2.09 (m, 1H), 2.23 (s, 3H), 2.38-2.51 (br, 6H),(2-methyl-5-[N′-[4-(4-methyl- 2.61 (br, 5H), 3.22 (m, 2H), 7.56 (d, 1H,J = 8.2 Hz), 7.91-7.93 piperazin-1-yl-methyl)-3-trifluoro- (m, 1H), 7.99(d, 2H, J = 8.3 Hz), 8.02-8.05 (m, 1H), 8.14 (m,methylbenzoyl]-hydrazino- 1H), 8.20 (m, 1H), 8.22(m, 1H), 8.24-8.26 (m,1H), 8.29 (m, 1H), carbonyl}phenylethynyl)pyridin- 8.62 (m, 1H), 10.70(s, 1H), 10.80 (s, 1H), 11.12 (s, 1H). 2-yl]amide I.12N-(5-{5-[N′-(2-(Chloro-6- 0.96 (t, 3H), 1.65 (m, 2H), 2.47 (t, 2H), 2.52(s, 3H), 2.60 (s, 3H), methylbenzoyl)hydrazinocarbonyl]- 7.31-7.35 (m,1H), 7.38-7.43 (m, 2H), 7.53 (d, 1H, J = 8.1 Hz),2-methylphenylethynyl}- 7.92-7.95 (m, 1H), 8.02-8.05 (m, 1H), 8.18 (m,1H), 8.22 (m, pyridin-2-yl)butyramide 1H), 8.62 (m, 1H), 10.52 (s, 1H),10.71 (s, 1H), 10.76 (s, 1H).

The compounds of the present invention can be used to treat disordersmediated by tyrosine kinases.

The following examples serve to illustrate the invention withoutlimiting the invention in its scope. The methods of preparing some ofthe starting compounds used in the examples are described as referenceexamples.

EXAMPLES Example 1 Preparation of cyclopropanecarboxylic acid(5-{5-[N′-(2-chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)amide(Formula I.1)

A mixture of3-({6-[(cyclopropylcarbonyl)amino]pyridin-3-yl}ethynyl)-4-methylbenzoicacid, N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride and1-hydroxybenzotriazole in N,N-dimethylformamide was stirred at ambienttemperature for 1 hr. 2-chloro-6-methylbenzohydrazide was added and themixture stirred for 12 hrs at ambient temperature. Concentration andtrituration of the residue with water produced a solid which wasfiltered, washed with water and finally dried in vacuo to get a whitesolid.

Example 2N-(5-{5-[N′-(2-chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-2-dimethylaminoacetamide(Formula I.2)

Starting from3-[(6-{[(dimethylamino)acetyl]amino}pyridin-3-yl)ethynyl]-4-methylbenzoicacid the compound of Formula I.2 was prepared by the process disclosedin example 1.

Example 3N-(5-{5-[N′-(2-Chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-3-(4-methyl-piperazin-1-yl)propionamide(Formula I.3)

Starting from compound of Formula II-3, the compound of Formula I.3 wasprepared by the process disclosed in example 1.

Example 4N-(5-{5-[N′-(2-Chloro-6-methyl-benzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-2-(4-dimethylaminopiperidin-1-yl)acetamide(Formula I.4)

Starting from compound of Formula II-4, the compound of Formula I.4 wasprepared by the process disclosed in example 1.

Example 5N-(5-{5-[N′-(2-Chloro-6-methyl-benzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-2-(3-dimethylaminopyrrolidin-1-yl)acetamide(Formula I.5)

Starting from compound of Formula II-5, the compound of Formula I.5 wasprepared by the process disclosed in example 1.

Example 6N-(5-{5-[N′-(2-Chloro-6-methyl-benzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)acetamide(Formula I.6)

Starting from 3-{[6-(acetylamino)pyridin-3-yl]ethynyl}-4-methylbenzoicacid, the compound of Formula I.6 was prepared by the process disclosedin example 1.

Example 71-(5-{5-[N′-(2-Chloro-6-methyl-benzoyl)-hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-3-cyclopropylurea(I.9)

A solution of 2-amino-5-iodopyridine in DMF was added to a stirredmixture of diphenylphosphoryl azide, cyclopropane carboxylic acid andtriethyl amine in toluene at 25 to 30° C. and stirred at 120-125° C. for3 hrs. The reaction mixture was concentrated and the crude product waspurified by flash chromatography on silica gel (elution with 20% ethylacetate in hexane) to provide 1-cyclopropyl-3-(5-iodo-pyridin-2-yl)urea.

A mixture of 2-chloro-6-methylbenzoic acid N′-(3-ethynyl-4-methylbenzoyl) hydrazide, 1-cyclopropyl-3-(5-iodo-pyridin-2-yl)urea,Pd(Pd)₂Cl₂), CuI and triethylamine in DMF was heated at 90° C. for 16hrs under nitrogen atmosphere. The reaction mixture was concentrated andthe crude product was purified by flash chromatography on silica gel(elution with 2% Methanol in MDC) to provide the title compound.

Pharmacological Activity

In-vitro Cell Proliferation Assay

K562/U937 cells (2×104 per well) were incubated with the testcompounds/vehicle in a total volume of 200 μL of media at 37° C. with 5%CO2. On day 4, 20 μL MTT 5 mg/ml was added and the cells were incubatedfor 4-5 hours followed by addition of 100 μL of 10% SDS prepared in0.06N HCl. The cells were incubated overnight at 37° C. with 5% CO2. OnDay 5 the optical density was measured at 570 nm with 630 nm asreference wavelength. The optical density in the vehicle treated wellswas compared with that of the test compound treated wells.

Results for the representative compounds of Formula I are provided inTable-2.

TABLE 2 Compd. c-Abl kinase (K562 cells); % Inhibition ID 100 nM 10 nM 1nM I.1 87.0 91.1 84.7 I.2 82.9 82.5 71.6 I.3 87.9 85.5 75.0 I.4 86.981.4 76.5 I.5 82.1 81.7 71.4 I.6 91.0 91.6 88.4 I.7 85.9 78.6 24.6 I.886.1 84.0 68.9 I.9 87.8 83.6 61.0 I.10 73.3 78.5 39.8 I.11 57.2 58.354.0 I.12 ND 80.6 33.6 ND: Not determinedMutated Abl (T315I) (Human)Kinase

In a final reaction volume of 25 μL, mutated Abl (T315I) (human) (5-10mU) is incubated with 8 mM MOPS pH7.0, 0.2 mM EDTA, 5004 EAIYAAPFAKKK,10 mM Mg(OAc)2 and [γ-33P-ATP] [specific activity approx. 500 cpm/pmol,concentration as required]. The reaction is initiated by the addition ofthe MgATP mix. After incubation for 40 minutes at room temperature, thereaction is stopped by the addition of 5 μL of a 3% phosphoric acidsolution. 10 μL of the reaction is then spotted onto a P30 filtermat andwashed three times for 5 minutes in 75 mM phosphoric acid and once inmethanol prior to drying and scintillation counting.

The compounds of Formula I showed good inhibitory action on the mutatedAbl T315I cell line. Activity data on the mutated Abl T315I cell linefor some representative compound is provided in Table-3.

TABLE 3 Abl-T315I Compd. % Inhibition ID 30 nM 3 nM I.1 98.0 87.0 I.287.0 50.0 I.3 94.0 59.0 I.4 95.0 70.0 I.5 96.0 66.0 I.6 89.0 68.0

The invention claimed is:
 1. A compound of Formula I

or a pharmaceutically acceptable salt thereof wherein, R₁ is selectedfrom —C₃₋₆ cycloalkyl, —C₁₋₆ alkyl-NH₂, —C₁₋₆ alkyl-NH(C₁₋₆ alkyl),—C₁₋₆ alkyl-N(C₁₋₆ alkyl)₂, —C₃₋₆ alkenyl, —C₃₋₆ alkynyl, —C₁₋₆ alkyl,—C₁₋₆ haloalkyl, and —NH(C₃₋₆ cycloalkyl); R₁ is optionally substitutedwith one or more group independently selected from the group consistingof —C₁₋₄ alkyl, halogen, CN, NH(C₁₋₆ alkyl), N(C₁₋₆ alkyl)₂, NH₂ andhydroxy; R₂ and R₃ are individually selected from a group of hydrogen,halogen, —C₁₋₄ alkyl, and —C₁₋₄ haloalkyl.
 2. The compound of Formula Iof claim 1 wherein, R₁ is —C₃₋₆ cycloalkyl; and R₂ and R₃ areindependently selected from a group consisting of hydrogen, halogen,—C₁₋₄ alkyl and —C₁₋₄ haloalkyl.
 3. The compound of Formula I as inclaim 1 selected from the group consisting of: Cyclopropanecarboxylicacid(5-{5-[N′-(2-chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)amide;N-(5-{5-[N′-(2-chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)-2-dimethylaminoacetamide;N-(5-{5-[N′-(2-Chloro-6-methyl-benzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)acetamide;Cyclopropanecarboxylic acid[5-(2-methyl-5-{N′-[3-(4-methylimidazol-1-yl)-5-trifluoromethylbenzoyl]-hydrazinocarbonyl}phenylethynyl)pyridin-2-yl]amide;1-(5-{5-[N′-(2-Chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methylphenylethynyl}-pyridin-2-yl)-3-cyclopropylurea;N-(5-{5-[N′-(2-(Chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methylphenylethynyl}-pyridin-2-yl)-2,2,2-trifluoroacetamide;andN-(5-{5-[N′-(2-(Chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methylphenylethynyl}-pyridin-2-yl)butyramide.4. The compound of Formula I of claim 3, wherein the compound iscyclopropanecarboxylic acid(5-{5-[N′-(2-chloro-6-methylbenzoyl)hydrazinocarbonyl]-2-methyl-phenylethynyl}-pyridin-2-yl)amide.